1056287781 has 12 divisors (see below), whose sum is σ = 1529779680. Its totient is φ = 702331560.

The previous prime is 1056287777. The next prime is 1056287801. The reversal of 1056287781 is 1877826501.

It is a happy number.

1056287781 is a `hidden beast` number, since 1 + 0 + 562 + 8 + 7 + 7 + 81 = 666.

It is not a de Polignac number, because 1056287781 - 2² = 1056287777 is a prime.

It is a super-2 number, since 2×1056287781² = 2231487752579807922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056287681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151425 + ... + 158246.

It is an arithmetic number, because the mean of its divisors is an integer number (127481640).

Almost surely, 2^1056287781 is an apocalyptic number.

It is an amenable number.

1056287781 is a deficient number, since it is larger than the sum of its proper divisors (473491899).

1056287781 is a wasteful number, since it uses less digits than its factorization.

1056287781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310056 (or 310053 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The square root of 1056287781 is about 32500.5812409563. The cubic root of 1056287781 is about 1018.4211704682.

The spelling of 1056287781 in words is "one billion, fifty-six million, two hundred eighty-seven thousand, seven hundred eighty-one".